from Phys.org
It was a "bartender thing" in the city to take a few peanuts and pop them into beers, Pereira said."Because the peanuts are denser than the beer, they first sink down to the bottom of the glass.
Then each peanut becomes what is called a "nucleation site". Hundreds of tiny bubbles of carbon dioxide form on their surface, acting as buoys to drag them upwards.
When the bubbles reach the surface, they burst.. The peanuts then dive down before being propelled up again by freshly formed bubbles,
more technical details at the link.
the scientists now plan to study how this varies with peanuts of different shapes and with different beers.
By the way, this is not the first time Scientific discoveries were made by observing beer bubbles:
Don Glaser ...won the 1960 Nobel Prize for Physics for his invention of the bubble chamber at Berkeley Lab. He discusses how, inspired by bubbles in a glass of beer, he invented the bubble chamber and detected cosmic-ray muons.
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